如何访问列表视图中包装在转发器中的按钮?

Question

我在ListView的ItemTemplate中有一个按钮(Id="checkInBtn"(，并且ListView位于UpdatePanel中。因此，我无法通过代码隐藏中的 ID 访问按钮(到目前为止，我只能通过其 eventHandler 访问它并将其转换为此处解决的发送者 - 因此只有在单击它时才能访问它(

现在，我想从单独的方法访问此按钮 - 我需要做的是在满足某个条件后让此按钮"闪烁"。 还有其他方法可以访问此按钮控件吗？

.ASPX：

<asp:UpdatePanel ID="UpdateList" runat="server">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="refreshInstructorList" EventName="Tick" />
</Triggers>
<ContentTemplate>
<asp:Timer ID="refreshInstructorList" runat="server" Interval="180000" OnTick="RefreshList"></asp:Timer> <!-- Every 3 minutes/ 180k ms -->
<asp:ListView
ID="lvInstructors"
runat="server"
AutoGenerateColumns="False"
ShowRegularGridWhenEmpty="False"
EmptyDataText="No Sessions to Display."
OnRowDataBound="lvDataBound"
OnRowCommand="lvCommand"
Visible="true">
<LayoutTemplate>
<div class="container" id="mainContent">
<asp:PlaceHolder ID="itemPlaceHolder" runat="server" />
</div>
</LayoutTemplate>
<ItemTemplate>
<div class="row instructorItem">
<div class="col-2 sessionStartTimeDiv">
<p class="sessionStartTime"><%#Eval("SessionStartTime")%></p>
</div>
<div class="col-2 instructorHeadshotDiv">
<asp:Image class="instructorHeadshot" runat="server" src='<%#Eval("InstructorHeadshot")%>' />
</div>
<div class="col-5 sessionInfoDiv">
<h3 class="instructorName"><%#Eval("InstructorName")%></h3>
<p class="sessionInfo"><%#Eval("SessionInfo")%></p>
</div>
<div class="col-3 checkInBtnDiv">
<asp:Button class="checkInBtn" ID="checkInBtn" runat="server" OnClick="CheckInBtn_Click" Text="Check-In"></asp:Button>
</div>
</div>
<hr />
</ItemTemplate>
<EmptyDataTemplate>
<br />
<br />
No Sessions to Display
</EmptyDataTemplate>
</asp:ListView>
</ContentTemplate>
</asp:UpdatePanel>

ASPX.CS：(我如何填充列表视图(

private void UpdateInstructorListView()
{
//Make Data table to hold ListViewItem Data 
DataTable dt = new DataTable();
dt.Columns.Add("SessionStartTime");
dt.Columns.Add("InstructorHeadshot");
dt.Columns.Add("InstructorName");
dt.Columns.Add("SessionInfo");
DataRow dr;
foreach (Session S in UpcomingSessions)
{
foreach (Enrollment I in S.Instructors())
{
//
SessionId = S.SessionId;
SessionStartTime = S.FirstDateTime().ToShortTimeString();
InstructorHeadshot = I.Headshot;
InstructorName = I.FirstName + " " + I.LastName;
SessionInfo = S.Name + " , " + S.Room.ToString();

//Fill rows in DataTable with variables
dr = dt.NewRow();
dr["SessionStartTime"] = SessionStartTime;
dr["InstructorHeadshot"] = InstructorHeadshot;
dr["InstructorName"] = InstructorName;
dr["SessionInfo"] = SessionInfo;
dt.Rows.Add(dr);
}
}

//Bind datatable to lv
lvInstructors.DataSource = dt;
lvInstructors.DataBind();
}

Answer 1

您必须多次使用 FindControl。首先，在正确的中继器项中找到列表视图。

var listview = Repeater1.Items[i].FindControl("ListView1") as ListView;

然后在正确的列表视图项中找到按钮。

var button = listview.Items[j].FindControl("checkInBtn") as Button;

现在您可以访问该按钮。

button.Text = "Button found!";

.ASPX

<asp:Repeater ID="Repeater1" runat="server">
<ItemTemplate>
<asp:ListView ID="ListView1" runat="server">
<ItemTemplate>
<asp:Button ID="checkInBtn" runat="server" Text="Button" />
</ItemTemplate>
</asp:ListView>
</ItemTemplate>
</asp:Repeater>